"A good ADHD assessment is not a test your child can pass or fail. It is a structured gathering of information from multiple sources — and all of that information matters, including yours."
Why assessment matters
An ADHD diagnosis is a clinical judgement based on information gathered from multiple sources across multiple settings. It is not a one-off observation, a single questionnaire, or a blood test. Understanding how assessment works helps you prepare effectively, contribute meaningfully, and interpret the outcome accurately.
A thorough assessment serves several purposes: it confirms whether ADHD is present; it identifies which presentation and how severe; it rules out other explanations for the difficulties observed; and it forms the basis for intervention recommendations. A well-conducted assessment should leave your family with a clearer picture of your child's profile and a practical starting point for support.
NHS versus private assessment
In the UK, ADHD assessment for children is available through the NHS and through private clinicians. Both routes should meet the same clinical standards, but differ in timeline, format, and cost.
NHS assessment pathways vary significantly depending on where you live. Referrals are typically made by a GP, school, or health visitor and may be directed to any of the following depending on your local service configuration:
- Neurodevelopmental services — dedicated teams assessing ADHD, autism, and related conditions, increasingly the most common route in many areas
- Paediatrics — community or hospital paediatricians who assess and diagnose ADHD, particularly in younger children
- CAMHS (Child and Adolescent Mental Health Services) — where ADHD assessment sits within a broader mental health team, more common where co-occurring emotional difficulties are present
- Combined or integrated pathways — some areas use multi-agency or joint assessment models involving more than one of the above
Waiting times on the NHS vary enormously by area — from months to several years in some regions. It is worth asking your GP specifically which service covers ADHD assessment locally and what the current waiting time is.
- Private route: Direct referral, typically with much shorter waiting times. Costs vary — a comprehensive private assessment typically ranges from £800–£1,500. The report is clinically valid and can be shared with schools and GPs. Medication, if recommended, often requires a shared care agreement with the GP.
- Right to choose (England): Under NHS England guidelines, patients have a right to choose their provider. This can sometimes expedite access to assessment via commissioned private providers at NHS cost.
If you are in North Wales: Dr John Connolly offers private ADHD assessments for children and young people through North Wales ADHD Assessment. Assessments include the Conners 4 (a well-validated ADHD-specific rating scale), structured clinical interview, and school collateral information. Full written report with formulation and recommendations provided.
What a thorough assessment involves
A comprehensive ADHD assessment for a child typically includes several components:
A structured or semi-structured interview covering the child's developmental history, presenting concerns, family history, current functioning across settings (home, school, social), and impact on daily life. This is one of the most important parts of the assessment. Prepare thoroughly.
Questionnaires completed by parents and teachers to quantify ADHD symptom frequency and severity. Well-validated ADHD-specific tools include the Conners 4 (Conners Rating Scales, 4th Edition) and the SNAP-IV. The SDQ (Strengths and Difficulties Questionnaire) is a broad-band screening tool also commonly used to gather collateral information across emotional, behavioural and social domains — it is not ADHD-specific but provides useful context. Scores are compared against normative data for the child's age and sex.
Teacher observations, academic records, and school-completed rating scales provide independent corroboration of difficulties across settings. ADHD should be present in more than one context — if difficulties are only observed at home or only at school, other explanations need consideration.
Depending on the child's age and the assessment format, the clinician may observe the child directly, conduct a brief interview, or administer specific cognitive or attention tasks. Note: a child may not display obvious ADHD behaviours during a clinical appointment — this does not invalidate the diagnosis.
A thorough assessment considers other conditions that can produce similar presentations — anxiety, depression, sleep disorders, learning difficulties, trauma responses, sensory processing differences, and autism. These may co-occur with ADHD or may be the primary explanation for the difficulties observed.
A thorough private assessment should result in a written report documenting findings, diagnostic conclusions, and specific recommendations for home, school, and any further interventions. This report is a useful document — keep it and share it with relevant professionals.
How to prepare
Your information is a vital part of the assessment. Prepare by gathering:
- A timeline of when difficulties first appeared and how they have developed
- Specific examples of how ADHD symptoms present at home — concrete, recent, representative instances rather than general descriptions
- Any previous professional observations or reports — from school, educational psychology, speech and language therapy, etc.
- Family history of ADHD, learning difficulties, or related conditions
- Information about your child's strengths and interests — a full picture is more useful than a deficit-only account
- A list of your questions — write them down. Appointments move quickly.
Questions to ask at the assessment
Ask specifically which presentation — inattentive, hyperactive-impulsive, or combined — and what the key areas of difficulty are.
Ask whether anxiety, autism, dyslexia, DCD, or other conditions have been identified or should be explored.
Ask specifically — not just "what can help" but "what does the evidence say for this specific presentation and age."
Ask for specific, concrete recommendations that you can take to school — not just "inform the school" but what they should be doing.
If medication is being considered or recommended, ask about the process, expected timeline, monitoring protocol, and what to expect during titration.
Ask about follow-up — how and when progress will be reviewed, and who the point of contact is if concerns arise between appointments.
After the assessment — what the diagnosis means
A diagnosis of ADHD is not a ceiling — it is a map. It tells you something accurate and useful about how your child's nervous system works, which creates the foundation for the right support. What it does not do is predict your child's future, define their capabilities, or change who they are. It names what was already there.
The most useful question after a diagnosis is not "why didn't we know sooner?" but "what do we do now?" The Understanding Your Child's ADHD guide has a practical next-steps section to help you prioritise.